Cavendish Professor of Physics at the Department of Physics, University of Cambridge. He has pioneered the study of organic polymers as semiconductors, and his research group has demonstrated that they can be used in a wide range of semiconductor devices, including light-emitting diodes and transistors.

He co-founded Cambridge Display Technology Ltd in 1994 and Plastic Logic Ltd in 2000 to develop directly-printed polymer transistor circuits. Currently, he is working on the use of polymer and related materials for thin-film photovoltaic diode applications.